Vivaldi was the composer of "The Four Seasons", which included "Spring" and "Summer".

He once offered to teach the Doctor how to play the violin. (AUDIO: The Paradox Planet)

When the Sixth Doctor called Signpost to determine why it was interfering with his TARDIS, the "on-hold" music was "Spring". He listened to it twenty-one times and angrily demanded of Vishesh Abeyesekere that he play something else, even if it was only "Summer". (PROSE: Outsourcing)

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